James mcphebson



taire stmt nim y Letters Patent No. 79,375, dated June 80, 1868.

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T0 .ALL WHOM IT MAY CONCERN: y

Be it known that I, JAMES McPnsnsoN, of Brooklyn, in the county f Kings, end State of New York, neve inveuteda new and improved Variable Cnt-Oill for Steam-Engines; and'I do hereby declare that the'following is sv inll,v clear, and exact description thereof, which will ennble others skilled in the nrt to make and use the' come, reference being had to the accompanying drawings forming part of this specioation. l Figure 1 represents a sideeleve'tion-of e steam-chest, provided with my improved variable ont-off.- Figure 2 is plan or'top view, partly in sectionfof the same. v Figure 8 is a vertical transverse' section of the same, token on the plane of theline a: g:',-iig. 1. Figure 4 is en inverted plan view, showing the connection between the governor and eccentric-spindle which regulnterthe moti-ons of the cut-ot): slides. 4

-Similar'letters of vxeicrcnce indicate corresponding parts.

g I '.llhis invention relates to anew variable cut-od' for steam-engines, which is connected with the governor, s y that'it will beV automsticeily adjusted as the pressure; of the steam comes above or b'elow a, certain desired degree.

` The inventioncousists chietlyin the rotstings'pindls, which are set eccentric in wheels or disks, yby which theynreI carried around, and which have projecting pins, `i y"\v'l1i. h they are 'connected with tire eut-olf, to which they impart lreciprocating"sliding motion. The 'seid spindles are-also connected with the governor in such a. manner' thst'as the bells nremore or less spread, the spindles will be turned' in the disks, so as to bring their conlnectonwith the cut-oi nearer `tool' forthcrffrom the centre of the rotating disk, end`to consequently lengthen v or shorten the lever by which the'cut ofi` is moved; thereby the cnt-off will-be caused to move less when the balls are spread thanjit; does when they are closed, ond consequently less steam is let into the cylinder when the engine moves `fest than there is' when it moves slow.

The inventionl also consists in a device for producing n quick lreturn motion of the-cut-off slides, which` is produced by c. novel device for connecting the eccentric-spindles with the disks that drive them.

A, ,inthe drawing, represents a steam-cylinder, o f ordinary or suitable construction. B `und C nre the slidesvalvcls, which'reccive their reciprocating m'otion from the eccentric'on the crank-shaft.

D E are the cut-.o' slides, moving respectively 'on the faces of the -valves B C,

Each slide or clit-o volvois' attached to a horizontalbar, a, whichhes'e. slotted arm, b, 4as shown in iig. 4, the direction of the slot being at rightI nngles'to that of 'the motion of thevalvc. I

F F nro two toothed wheels, of equal dinmetrs, mounted on hollow vertical axles that hhve 'their bearings in a projecting -portiouL/G, -oftlze bedl of the cylinder, vor in sone other stationary device. These two wheels F l? mesh iu'to each other, as. shown, and rceiverotnry motion' by means of a pinion, c, that is mounted on the govcrnor-shaftHt Thor-'governor is'of'ffsuitablc' construction ond arrangement, and its shaft Hvreceives rotary motion by in'eans of gearingdior otherwi'sdfrolnethe crank-shaft.

Through 'theho'llo'w nx-lefeliichfwhel Fis iittedulcirculolr block or tube', e, asv in iig. 3. The' lower end or nny portion of, eachlblolckz', l ftnbere'.curriegcseg'xental' or'other `toothed wheel, m, es' in tig. 4,'both these segments meshing. into 'a'.tootledln'q,Minchia, bysbell-crank, 72,v connected wth'n rod, z', that is moved up f and down as the sleev'el of thegmfrnor -movesgnp 'end`down, the rod t being connected with the sleevel, as is indicote'din iig. 1. Y I Thus, as the balls J of the'governor are .spread by rapid motion, the sleeve will be' raised, andthe bar g will 4be pushed frward, so as to tn'rn the tubes ein tbedirection of the arrow 1, iig. 2.

When the balls of the governor drop by slow-motion, they lower the sleeve, and thereby the bar g is drawn beck to turn the blocks e in the direction oppositeto that indicated by the arrows 1.

. Upon ccch tube or block e is placed a. plete," or, as I rather term it, spindle, j, which is, by ineens of :t piu K, connected eccentrically with the'tube e, und which is, 'by means of alpin, f, that projects from the wheel F,

connected nlso with the said wheel F. Fromthe face of each spindle j projects an eecentrie-pn, l, through une ofthe slotted arms, b, as shown.

2 mans' j By the rotating wheel Ffthespindle j,connected`with each whoeLis revelved aundthefeeeentricixlekg and, as the spindle is thus revolved, itwill-innpart, by its connection! b 'a, reciproeatingmotion to thefonf-oll',

valve to which it belongs. As the' spindle lscarried around theaxis K, which il eccentric to the shaft around' which the pin fdriving the spindle turns, it follows that the spindle will turn qnicker-whenithnpin fisneorent to the axis of the spindle, and slower when they are further apnrt. New, ,the-pin is*{o et'on-the1gnindlo, that it serves vto close the slide D or E, whenfth'e sa'id 'pin'sf and K are nearest' tog'e motion of the ont oiis obtained. l 'I By the aforementioned adjustment o'f'thetubes c byfthe goven'cth' trned, so as to set the V acting upon and moving the'cut-ofl valves, will consequently be lengthe'ned or'sh'ortened such nnndjgstlnent ofthe pin Ztowerds the axisrof thewheels. A

Ths, when the `governor-mils.ni-e quite extended, the pin l ofthe spindle andthe axis of thefwheel will be neer together, so thnt but very little motion'is'impnrted to thecut-oralveywhich willtben not `for open the aperture ofits slide-valve. v

It' the pin Zwere brought quite in line with the axis of the wheel, the,v

ut-o` would not ,be moved let all. When the pin Z is, b'y the slow motion of thegovernor, brought further all` the exis of the wheel F, the lever operating on the cut-ofwill belengthene of steam into the cylinder. I l

The pin f, which divides the spindle, nlnet, to allow thenforesaid'adjnstments lot' the spindle, .t through aslot in the spindle, as shown. f

I claim as new, and desire to secure by Lettere Patentn 1. The nrrengementand combination, with each other, of the not'ating wheels-F, (ttcd'aroundthe tubes or loose axles e,) and of the spindles j, connected eccentricnlly with Ithe a xles e, and also' with the wheels F, and

with the cut-oil` slides D end E, substantially as herein shown and described."

2.` The movable sleeve I ofthejgovernoLlevers It, and rack g, with the tuhes'or ailes e. :,arranged 'snb.

d,land the motionofthe eutoilincreased, vso as to leta lnrger quantitystantially as herein shown end described, whereby to varythecutolf with the motion of the engine, es-eetforth."

3@ The construction and arrangement ofthe e'ccentric-spindlej, whereby vtoi-convert the rotary motion o f the wheel F into the reciprocating motion of the cnt-ofi', and-:which--i's ladjusrtnhle' in andbythe'axle aref` thewheel.

F, that turns lose in the wheel, as set forth.'

Witnesses:

WM. F. MeNAMAnA, ALEX. F. RoBEBTs.

JAMES' McPHERsoN. 

